People who train with weights almost every day typically plan a spit into their workouts to avoid training the same muscle groups on consecutive days. Is this really necessary? A study published in The Journal of Sports Medicine and Physical Fitness compares the effects of consecutive whole body training to working all muscle groups on non-consecutive days.

Researchers assigned 11 recreationally active men to train on 3 non-consecutive days each week and 10 others to train 3 days in a row. Compared to measurements taken before the 7-week intervention, both groups gained significant amounts of leg press and bench press strength along with arm and chest size. There were no real differences between groups.
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